Very broken test of affine-transforming quads

src/main/java/io/github/cottonmc/templates/model/AffineQuadTransformer.java

@@ -0,0 +1,57 @@
+package io.github.cottonmc.templates.model;
+
+import net.fabricmc.fabric.api.renderer.v1.mesh.MutableQuadView;
+import net.fabricmc.fabric.api.renderer.v1.render.RenderContext;
+import net.minecraft.util.math.AffineTransformation;
+import net.minecraft.util.math.AffineTransformations;
+import net.minecraft.util.math.Direction;
+import org.joml.Matrix4f;
+import org.joml.Vector3f;
+import org.joml.Vector4f;
+
+public record AffineQuadTransformer(Matrix4f affineMatrix) implements RenderContext.QuadTransform {
+	public AffineQuadTransformer(AffineTransformation aff) {
+		this(aff.getMatrix());
+	}
+	
+	@Override
+	public boolean transform(MutableQuadView quad) {
+		Matrix4f mat = affineMatrix;
+		//TODO: Hard Coded for DEBUGGING
+		mat = (
+			AffineTransformations.DIRECTION_ROTATIONS.get(Direction.NORTH)
+		).getMatrix();
+		
+		Vector3f pos3 = new Vector3f();
+		//Vector3f norm3 = new Vector3f();
+		
+		//ugh
+		Vector4f pos4 = new Vector4f();
+		//Vector4f norm4 = new Vector4f();
+		
+		for(int i = 0; i < 4; i++) {
+			//Copy quad data into vec3's 
+			quad.copyPos(i, pos3);
+			//quad.copyNormal(i, norm3);
+			
+			pos3.add(-0.5f, -0.5f, -0.5f); //TODO HACK
+			
+			//Initialize the x/y/z components of vec4s using that data
+			//W component of normal vector is set to 1, normal vectors transform differently from points :)
+			pos4.set(pos3, 0);
+			//norm4.set(norm3, 1);
+			
+			//Compute the matrix-vector product. This function mutates the vec4 in-place.
+			//Note that `transformAffine` has the same purpose as `transform`; the difference is it
+			//assumes (without checking) that the last row of the matrix is 0,0,0,1, as an optimization
+			mat.transformAffine(pos4);
+			//mat.transformAffine(norm4);
+			
+			//Manually copy the data back onto the vertex
+			quad.pos(i, pos4.x + 0.5f, pos4.y + 0.5f, pos4.z + 0.5f);
+			//quad.normal(i, norm4.x, norm4.y + 1, norm4.z);
+		}
+		
+		return true;
+	}
+}

src/main/java/io/github/cottonmc/templates/model/SlopeBakedModel.java

@@ -8,6 +8,7 @@ import net.minecraft.client.render.model.BakedModel;
 import net.minecraft.client.texture.Sprite;
 import net.minecraft.client.util.SpriteIdentifier;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.math.AffineTransformation;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.random.Random;
 import net.minecraft.world.BlockRenderView;
@@ -16,14 +17,16 @@ import java.util.function.Function;
 import java.util.function.Supplier;
 
 public final class SlopeBakedModel extends ForwardingBakedModel {
-	public SlopeBakedModel(BakedModel baseModel, BlockState slopeState, Function<SpriteIdentifier, Sprite> spriteLookup) {
+	public SlopeBakedModel(BakedModel baseModel, BlockState slopeState, AffineTransformation aff, Function<SpriteIdentifier, Sprite> spriteLookup) {
 		this.wrapped = baseModel;
 		
 		this.preparer = new SlopeMeshTransformPreparer(spriteLookup);
-		this.baseMesh = SlopeBaseMesh.make(slopeState);
+		this.affineTransformer = new AffineQuadTransformer(aff);
+		this.baseMesh = SlopeBaseMesh.make(slopeState.getBlock().getDefaultState()); //TODO
 	}
 	
 	private final TemplateQuadTransformPreparer preparer;
+	private final RenderContext.QuadTransform affineTransformer;
 	private final Mesh baseMesh;
 	
 	@Override
@@ -33,15 +36,19 @@ public final class SlopeBakedModel extends ForwardingBakedModel {
 	
 	@Override
 	public void emitBlockQuads(BlockRenderView blockView, BlockState state, BlockPos pos, Supplier<Random> randomSupplier, RenderContext context) {
+		context.pushTransform(affineTransformer);
 		context.pushTransform(preparer.blockTransformer(blockView, state, pos, randomSupplier));
 		context.meshConsumer().accept(baseMesh);
 		context.popTransform();
+		context.popTransform();
 	}
 	
 	@Override
 	public void emitItemQuads(ItemStack stack, Supplier<Random> randomSupplier, RenderContext context) {
+		context.pushTransform(affineTransformer);
 		context.pushTransform(preparer.itemTransformer(stack, randomSupplier));
 		context.meshConsumer().accept(baseMesh);
 		context.popTransform();
+		context.popTransform();
 	}
 }

src/main/java/io/github/cottonmc/templates/model/SlopeUnbakedModel.java

@@ -31,6 +31,7 @@ public record SlopeUnbakedModel(BlockState slopeState) implements UnbakedModel {
 		//TODO: weird, should use my own model instead
 		BakedModel baseModel = baker.bake(BlockModels.getModelId(Blocks.SANDSTONE_STAIRS.getDefaultState()), modelBakeSettings);
 		
-		return new SlopeBakedModel(baseModel, slopeState, function);
+		//TODO: ModelBakeSettings.getRotation is always the identity transform atm
+		return new SlopeBakedModel(baseModel, slopeState, modelBakeSettings.getRotation(), function);
 	}
 }